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        <h1><a href="http://developer.yahoo.com/yui/" title="Yahoo! UI Library">Yahoo! UI Library</a></h1>
        <h3>event-custom&nbsp; <span class="subtitle">3.1.1</span></h3>
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                 &gt; Do.Error 
                
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                            Class <b property="yui:name">Do.Error</b>
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                        <div class="deprecated"><strong>Deprecated:</strong> use Y.Do.Halt or Y.Do.Prevent</div>
  

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                        Return an Error object when you want to terminate the execution
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